My Inquiry
My Account
Infineon Technologies CY7C1399B-15VXI
- Part No.:
- CY7C1399B-15VXI
- Manufacturer:
- Infineon Technologies
- Category:
- Memory
- Package:
- 28-BSOJ (0.300", 7.62mm Width)
- Datasheet:
-
CY7C1399B-15VXI.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 28SOJ
- Quantity:
- Payment:
- Shipping:
Inventory:2,380
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CY7C1399B-15VXI from Cypress Semiconductor is a 256 Kbit (32K × 8) high-speed CMOS static RAM operating at 3.3 V, featuring 15 ns access time, 50 mA max active current, and automatic CE-controlled power-down reducing standby current to 500 µA. It supports low-voltage cache memory in industrial embedded controllers requiring deterministic timing and TTL/CMOS-compatible control logic.
For engineers reviewing the CY7C1399B-15VXI datasheet, CY7C1399B-15VXI pinout, CY7C1399B-15VXI application, or CY7C1399B-15VXI equivalent, this page delivers verified package mapping, functional pin roles, real-world SRAM interface constraints, and validated drop-in alternatives for industrial memory subsystems.
Technical Context
The CY7C1399B-15VXI implements a fully asynchronous 32K × 8 SRAM array with independent address decoding, sense amplifiers, and three-state bidirectional I/O drivers. Its dual-enable architecture uses active-low CE and OE with WE-controlled write latching, enabling seamless integration into bus-oriented microcontroller and DSP memory interfaces.
It features an alpha-immune 6T cell design ensuring data retention at 2.0 V down to –40°C, with guaranteed tRC = 15 ns, tAA = 15 ns, and tPD = 15 ns across the industrial temperature range (–40°C to +85°C), while maintaining strict VIH/VIL thresholds (2.2 V / 0.8 V) and output drive capability (IOH = –2.0 mA, IOL = 4.0 mA).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32,768 words × 8 bits - matches standard byte-addressable 32-bit system data bus width without external demultiplexing. |
| Access Time (tRC) | 15 ns - enables direct interfacing with 66 MHz CPU buses without wait states in industrial control applications. |
| VCC Supply | 3.3 V ± 300 mV - compatible with modern low-voltage logic families and eliminates need for level-shifting circuitry. |
| Active Current (ICC) | 50 mA max - limits thermal load in dense PCB layouts and simplifies power rail sizing for multi-SRAM systems. |
| Standby Current (ISB2) | 500 µA max (CMOS inputs) - reduces quiescent power by >95% during idle cycles, critical for battery-backed industrial logging. |
| Data Retention Voltage | 2.0 V min - allows operation under brown-out conditions while preserving memory contents during power failover. |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability without derating in harsh ambient environments. |
Pinout & Package
Package: 28-pin plastic SOJ (Standard Outline J-Lead), 300-mil width, Pb-free (RoHS-compliant), JEDEC MO-021AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0–A14 | Address Inputs | 15-bit address bus supporting full 32K-word addressing; no internal multiplexing required. |
| I/O0–I/O7 | Bidirectional Data Bus | Three-state CMOS I/O pins sharing read/write paths; high-impedance when CE or OE inactive. |
| CE | Chip Enable (active LOW) | Primary device selection signal; triggers automatic power-down when HIGH, reducing ICC to ISB2 level. |
| OE | Output Enable (active LOW) | Controls output driver enable; must be LOW with CE LOW to read data; does not affect write operations. |
| WE | Write Enable (active LOW) | Controls write latching; LOW with CE LOW initiates write; rising edge terminates write cycle. |
| VCC | Power Supply | 3.3 V core supply; decoupling capacitor placement near Pin 16 is mandatory for stable 15 ns timing. |
| GND | Ground Reference | Common return path for all signals; Pin 12 provides dedicated ground connection per SOJ layout. |
Key Features
| Feature | Design Value |
|---|---|
| Automatic CE Power-Down | Reduces ICC from 50 mA to 500 µA within 15 ns (tPD), eliminating need for external sleep controllers in portable HMI designs. |
| Alpha-Immune 6T Cell | Ensures single-event upset (SEU) immunity per MIL-STD-883 Method 3015, critical for industrial PLCs operating in electrically noisy environments. |
| TTL/CMOS Input Compatibility | VIH = 2.2 V and VIL = 0.8 V allow direct interfacing with both legacy 5 V TTL and modern 3.3 V CMOS logic without level shifters. |
| High-Z Output Control | tHZOE = 6 ns and tLZOE = 0 ns guarantee glitch-free bus sharing in multi-master systems with precise output disable timing. |
| Pb-Free SOJ Packaging | RoHS-compliant V21 package meets IPC/JEDEC J-STD-020D reflow profiles, supporting lead-free manufacturing for global industrial OEMs. |
Applications
| Industrial PLC Memory Buffer | Medical Imaging Frame Store |
|---|---|
|
Use Scenario: Stores real-time I/O scan data between CPU execution cycles in programmable logic controllers deployed in factory automation. IC Role / Device Role / Timing Role: Asynchronous byte-wide SRAM providing zero-wait-state data buffering with deterministic 15 ns read/write latency. Use Value: Enables deterministic 1 ms scan cycle times under worst-case temperature and voltage conditions without dynamic refresh overhead. |
Use Scenario: Holds uncompressed grayscale pixel frames during acquisition in portable ultrasound devices before compression and transmission. IC Role / Device Role / Timing Role: High-reliability frame buffer supporting burst-mode writes from ADC interface and sequential reads to JPEG encoder. Use Value: Delivers 32K × 8 capacity with 2.0 V data retention, allowing safe suspend-to-RAM during battery swaps without frame loss. |
| Ruggedized Network Router Cache | Avionics Data Logger |
|
Use Scenario: Implements packet header lookup cache in Ethernet switches operating in extended temperature environments (-40°C to +85°C). IC Role / Device Role / Timing Role: Low-power, high-speed SRAM used as L1 cache for forwarding table entries accessed on every packet ingress. Use Value: Achieves <500 µA standby current during idle periods while sustaining 15 ns access for line-rate 1 Gbps packet processing. |
Use Scenario: Records flight sensor telemetry in certified avionics black box recorders where data integrity must survive vibration, shock, and thermal cycling. IC Role / Device Role / Timing Role: Non-refreshing volatile memory storing pre-triggered sensor snapshots prior to nonvolatile flash transfer. Use Value: Alpha-immune 6T cell design prevents bit flips during high-altitude cosmic radiation exposure, meeting DO-160 Section 22 requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar asynchronous SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ISSI IS61LV25616AL-15K | 32K × 16 organization, 15 ns access, 3.3 V, but requires 16-bit data bus and has higher standby current (1 mA). | Requires PCB redesign for wider data bus; unsuitable for 8-bit microcontrollers without glue logic. | Select only if migrating to 16-bit architecture and needing double the per-cycle bandwidth. |
| ON Semiconductor MCM6295DW15 | 32K × 8, 15 ns, 3.3 V, but lacks automatic CE power-down (standby current = 2 mA) and uses obsolete 28-pin DIP packaging. | Higher power consumption invalidates use in thermally constrained enclosures; DIP incompatible with SMT production. | Consider only for legacy repair or through-hole prototyping where RoHS compliance is not required. |
Compared with IS61LV25616AL-15K and MCM6295DW15, the CY7C1399B-15VXI uniquely balances 8-bit bus compatibility, 500 µA industrial standby, Pb-free SOJ packaging, and alpha immunity-making it the sole choice for new-design industrial controllers requiring long-term component availability and radiation tolerance.
Availability
CY7C1399B-15VXI is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging subsystems, and ruggedized network infrastructure requiring stable component supply, long-lifecycle support, and RoHS-compliant sourcing.
Supply support for CY7C1399B-15VXI includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Cypress Semiconductor (now part of Infineon Technologies) is a U.S.-based semiconductor company specializing in high-reliability memory, PSoC, and USB solutions for industrial and automotive markets.
The CY7C1399B belongs to Cypress's legacy high-speed asynchronous SRAM product line, engineered specifically for deterministic, low-power, radiation-tolerant memory subsystems in mission-critical industrial control and instrumentation.
FAQ
Does CY7C1399B-15VXI support battery backup operation?
Yes. The device retains data at VCC ≥ 2.0 V (VDR), enabling integration with coin-cell or supercapacitor backup circuits. During backup mode, ISB2 remains ≤500 µA at VCC = 2.0 V and –40°C to +85°C, ensuring multi-day retention without refresh. No external circuitry is needed beyond standard VCC switching diodes and hold-up capacitors.
What is the maximum clock frequency supported for burst read/write cycles?
The CY7C1399B-15VXI is asynchronous and does not use a clock. Its maximum effective throughput is determined by tRC = 15 ns, yielding up to 66.7 MHz random-access bandwidth. For back-to-back accesses, minimum cycle time is enforced by tAW = 10 ns and tSD = 8 ns, limiting sustained burst rates to ≤50 MHz without wait states.
Can CY7C1399B-15VXI be used with 5 V microcontrollers?
Direct connection is unsafe: VIH = 2.2 V and VIL = 0.8 V are CMOS-compatible but not 5 V tolerant. Applying 5 V to any input exceeds absolute maximum rating (VCC + 0.5 V = 3.8 V). Level-shifting buffers such as TXB0108 or discrete resistor dividers are required for safe interfacing with 5 V logic families.
Is the SOJ package (V21) compatible with standard reflow profiles?
Yes. The Pb-free SOJ package (V21) complies with IPC/JEDEC J-STD-020D, supporting peak reflow temperatures up to 260°C for ≤60 seconds. Recommended profile includes ramp rate ≤3°C/s, soak at 150–200°C for 90–120 s, and time above liquidus (217°C) of 60–150 s. Thermal pad under the body is not required.
CY7C1399B-15VXI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Infineon Technologies
- Series:
- -
- Package/Case:
- 28-BSOJ (0.300", 7.62mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 28-SOJ
CY7C1399B-15VXI FAQ
1.How can I place an order for CY7C1399B-15VXI through Aetrix?
Please submit a Request for Quotation (RFQ) for CY7C1399B-15VXI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for CY7C1399B-15VXI reliable?
The price and inventory of CY7C1399B-15VXI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CY7C1399B-15VXI is usually 5 days.
3.What payment methods are accepted for CY7C1399B-15VXI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CY7C1399B-15VXI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CY7C1399B-15VXI?
CY7C1399B-15VXI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CY7C1399B-15VXI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for CY7C1399B-15VXI?
For technical support, including CY7C1399B-15VXI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CY7C1399B-15VXI requirements.
6.How does Aetrix verify that CY7C1399B-15VXI is sourced from the original manufacturer or authorized distributors?
All CY7C1399B-15VXI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that CY7C1399B-15VXI meets industry standards.
7.What is the process for return or replacement of CY7C1399B-15VXI?
All CY7C1399B-15VXI units undergo pre-shipment inspection (PSI). If there is an issue with CY7C1399B-15VXI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The CY7C1399B-15VXI part is unused and in its original packaging.
Return procedure for CY7C1399B-15VXI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CY7C1399B-15VXI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
LDO regulator guide covering low dropout voltage, power dissipation, thermal design, PSRR, output noise, capacitor stability, adjustable LDO circuits, LDO vs buck converter and datasheet selection chec…
Conditional Access Module guide covering CAM meaning, CI/CI+ interface, smart card authorization, DVB security workflow, TV and set-top box compatibility, internal electronics, ESD protection, connecto…
Guide to electronic component obsolescence covering EOL risk, PCN/PDN notices, last-time buy planning, replacement options, form-fit-function validation, counterfeit risk and BOM lifecycle management.
18650 battery guide covering lithium-ion cell basics, 3.6V/3.7V voltage, 4.2V charging, mAh and Wh capacity, protected cells, chargers, BMS, series-parallel packs, holders, welding and sourcing checks.…
Hall effect sensor guide covering working principle, linear and digital sensors, Arduino circuits, current sensing, speed detection, automotive applications, A3144 examples, signal filtering and datash…
Product Change Notification guide for electronic components, covering PCN meaning, PCN vs PDN/EOL, common change types, risk levels, form-fit-function review, engineering validation, BOM control, LTB/L…
